Harden will replace DeWitt in the role of Rebecca Halliday, a lawyer who defends the Atlantis Cable News channel during a lawsuit for wrongful dismissal.

TVLine reports that Harden will reshoot the scenes that DeWitt has already filmed.

HBO confirmed that DeWitt's departure has come about because of a scheduling conflict, saying in a statement: "As the production schedule for season two of The Newsroom has shifted, Rosemarie DeWitt... will no longer be able to continue in her role."